Arthur DiBianca’s Skies Above often uses just the letters, no enter, which was interesting, although the game itself is a pile of minigames which are (probably intentionally) somewhat tedious once you solve the puzzle of each. Also, @Draconis, this might be an interesting example of going to locations instead of having directions, though I gather you’ve already found something that works for you…
Also Kara’s IF D-Pad thread where she made an AutoHotKey script that sends N<enter> etc. when you hit the keys on the numpad. Handy convenience if you’re on Windows (AutoHotKey is Windows-only, unfortunately).